Method of starting thread on bobbins



1947- LA VERNE R. GRAYBEAL 2.431.323

METHOD OF STARTING THREAD ON BOBBINS Filed Jan. 13, 1945 2 Sheets-Sheet 1 lalrlzejl. Emg fieal 1947- LA VERNE R. GRAYBEAL 2,431,323

METHOD OF STARTING THREAD ON BOBBINS 2 Sheets-Sheet? Filed Jan. 13, 1945 a z w Patented Nov. 25, 1947 BOBBIN La Verne R. Graybcal, Eliaabethton, Tcnn., as-

signor to North American Rayon Corporation, New York, N. Y., a corporation of Delaware Zpplication January 13, 1945, Serial No. 572,645

2 Claims. (Cl. 57-156) This invention relates to bobbins and more particularly to bobbins of the type used for collecting finished thread.

In the conduct of winding operations one of the difliculties encountered is the threading up of the thread collecting apparatus and the proper disposition of the thread on the bobbin when the collecting is resumed after the dofiing of a filled bobbin. These difiiculties are greatly magnified in the continuous production of synthetic-thread, since the thread as produced, after-treated and dried is continuously fed to the collecting device and the interruption in the take-up necessary during the doffing of a completely wound bobbin introduces complications in thread handling. Therefore it is customary to introduce into such a system devices capable of temporarily taking up the oncoming thread while an empty bobbin is being substituted for a wound one.

Various suggestions as to the handling of the thread during such dofling operations and the returning of the thread to the empty bobbin preparatory to resuming the collections of the thread have been made, as is evidenced by the issue on February 21, 1933, of U. S. Patent Number 1,898,206 to Nicgret.

In the winding of bobbins as heretofore practiced the thread which is directed against the cylindrical portion of an empty bobbin usually contacts the bobbin and starts winding thereon a distance of a few inches from the end. This leave a "tail which, due to centrifugal force of the rapidly spinning bobbin, lies in a position substantially perpendicular to the axis of the bobbin and tangent circumference thereof. Such a "tail does not become covered until a large number of thread turns have been laid on the bobbin, and it often occurs in unwinding the thread from the bobbin that the tail thus'embedded in the thread turns causes the thread to become entangled so that an indeterminate amount of spoilage occurs. Moreover, depending on the length of the "tail" and its longitudinal location on the bobbin, it is not infrequent to have the end of this tail contact the ring about which the traveller of a ring twister runs. Such contact of the ring by the tail not only interferes with the proper functioning of the traveller but also frequently-contaminates the yarn package with lubricant gathered from the ring.

The primary object of this invention is to so locate the end of the thread at the beginning of the winding operation that entanglement of the thread end with the thread layers is avoided. Other objects of this invention will become apparent to those skilled in'the' art from a reading of this specification.

. The above and other objects may be attained by employing this invention, which embodies among" its features a core upon which thread is wound, and at least one flange between the ends of the core having a slit extending preferably from its periphery to the core into which the thread to be collected is introduced, and the tail" or end of the thread is maintained wholly outside of the thread package.

In the drawings:

Figure 1 is a fragmentary front view in elevation of a ring twister equipped with this improved bobbin; a

Figure 2 is a fragmentary perspective view illustrating how the thread is directed into the slit in the bobbin flange;

Figure 3 is a horizontal sectional view of a twisting bobbin showing a radial slit in the flange in detail;

Figure 4 is a front view of a winding bobbin embodying this invention;

Figure 5 is a sectional view taken on the lin 55 of Figure 4;

Figure 6 is a horizontal sectional view of another embodiment of the twisting bobbin of the invention showing a radial slit in the flange which does not extend from the periphery to the core.

Figure 7 is a horizontal sectional view of a further embodiment of the twisting bobbin of the invention showing a radial slit which likewise does not extend from the periphery to the core, that part of the core projecting outwardly from the flange being a polyhedron.

Figure 8 is a horizontal sectional view of a still further embodiment of the twisting bobbin of the invention showing a non-radial slit which does not extend from the periphery to the core, that part of the core designed to carry the thread tail being a polyhedron.

In Figs. 6, 7 and 8, representing modified embodiments, the figures are analogous to Fig. 5 and are assumed to be taken from viewpoints analogous in location to line 5--5 of Fig. 4 in the case of bobbins not shown in their entirety and differing in flange and core end structure as hereinbefore pointed out.

Referring to the drawings in detail, a ring twister designated generally by Hi comprises standards upon which a suitable spindle rail H is supported horizontally in spaced relation to the floor. of a building. Rotatably mounted at spaced intervals on the spindle rail H are spindle assemblies I2 upon the blades l3 of which twisting bobbins, to be more fully hereinafter described, are adapted to be mounted. Each spindle assembly I2 is provided with a whirl I4 which is adapted to be driven in the conventional manner by belts I6. Each spindle assembly I2 is provided with a spindle brake adapted to be thrown into spindle motion arresting position by pressure on a'knee pad I6, or other equivalent unclaimed means.

Mounted for reciprocal motion parallel with the longitudinal axes of the spindle assemblies I2 and adapted to move a distance substantially equal to the length of the spindle blades I8 is a ring rail I! to which rings I8 are attached in concentric relation to their respective spindle assemblies. Each ring I8 is equipped with a ring traveller I9, and secured to the frame of the machine in axial alignment with each spindle assembly I2, but spaced a considerable distance above the upper ends of the spindle blades l3, are thread guides 26 through which thread to be twisted is directed downwardly and through the respective traveller I9 to the twisting bobbin carried by the spindle assembly.

So far the equipment disclosed follows that conventionally employed in ring twisting frames. In order to provide a rigid support for the thread as it is being twisted, a, bobbin designated generally b 2| is provided. This bobbin resembles the bobbins conventionally employed on ring twisters such as has just been described in that it comprises a core 22 having an axial bore 23 for the accommodation of one of the spindle blades I3. As in the conventional form of bobbin, the lower end of the bobbin 2I is provided with a transverse groove 24 for the accommodation of a key carried by the upper end of the whirl I4. Carried by the core 22, in spaced relation to its lower end, is a flange 25 forming the lowermost abutment against which the thread wound on the bobbin rests. The spacing of the flange 25 from the lower end of the core forms a, core part 26 between the flange and the end of the bobbin, the purpose of which will hereinafter appear. In some instances the upper end of the bobbin may be provided with a flange 21 which forms an upper abutment for the thread. Formed in the flange 25 and extending preferably radially from the periphery of the core through th extreme outer edge of the aforesaid flange 25 is a slit 28 which establishes communication between the surface of the core 22 and its part 26.

When a bobbin is to be dofl'ed, pressure is applied to the knee pad I6 of its respective spindle assembly so as to actuatethe spindle brake and arrest rotation of the spindle blade I3 against the driving force of the belt I5. During this operation the oncoming thread is separated or severed from that which has been wound on the bobbin, and the free end of the oncoming thread is directed to a temporary take-up device (not shown). In some instances it may prove desirable to direct the free end of the oncoming thread to a second twisting bobbin operating adjacent that being dofied. In any event, some form of thread take-up must be resorted to in order to give the operator an opportunity to substitute an empty bobbin for a filled one. The filled bobbin is removed from the spindle blade by lifting it off of the upper end thereof and an empty bobbin is substituted therefor, the operator making sure that the key on the whirl enters the' groove 24 formed in the lower end of the bobbin. The oncoming thread moving toward the bobbin through the thread guide 20 to the temporary take-up is flrst broken and the free end of the oncoming thread is then directed first through the ring traveller I9 of the respective twisting unit and then to the temporary take-up, so that the oncoming thread travels through thethread guide 20 inside the ring I8 and through the ring traveller I9 to the temporary take-up. The device is now ready for the last and final step in the resumption of the twisting operation. This final step simply consists in intercepting the oncoming thread between thering traveller I6 and the temporary take-up and directing the moving thread into the slit 28 inthe flange 25 of the empty bobbin 2I with the simultaneous release of pressure onthe knee pad I6, which allows the spindle assembly I2 and its associated empty bobbin 2I to start rotation, Breaking the thread between the bobbin and the temporary take-up leaves a length of thread or tall for which provision is made as follows: As the bobbin revolves and winds the oncoming thread onto its core 22 the length of thread or tail which projects through the slit 28 eventually winds about the core part 26, and inasmuch as it is wholly below to be tied or otherwise fastened to the beginning thread of a filled bobbin before the partially used bobbin has been wholly emptied.

In the modified form of the invention as illustrated in Figures 4 and 5, a winding bobbin designated generally by 30 comprises a winding core 3| provided at opposite ends with flanges 32 and 33. Trunnions 34 and 35 project beyond the. ends of the core 3| for engagement in the usual bear-Y ing elements of a conventional winding frame. Extending between the trunnion 35 and the flange 33 is a core part 36 of a diameter substantially equal to that of the core 3|, and formed in the flange 33 is a slit 31 which extends from the periphery of the core 3| through the outer edge of the flange.

In the modified embodiments of the invention illustrated in Figs. 6, 7 and 8 the bobbin is basically the same .as that represented by Figs. 3, 4 and 5, except that the slits in the flanges do not extend from the periphery to the cores and that the ends of the cores extending outwardly from the flanges in two of the embodiments are of deflnite geometric configuration. Thus, in Fig. 6 the bobbin is indicated generally by 38, the flange thereof by 33, the core by 40, the axial bore by 4I and the slit in the flange by 42. bobbin is indicated generally by 43, the flange by 44, the slit in the flange by 45, while 46 indicates the portion of the core extending outwardly beyond the flange, said portion being represented as a polyhedron. In Fig. 8 the bobbin is indicated generally by 41, the flange thereof by 48, the slit in the flange by 49 and the portion of the core extending outwardly from the flange by 50, said portion again being a polyhedron and the slit being non-radially located with respect to the core.

Tostart winding on bobbins of the type de- In Fig. 7 the scribed, the thread from a suitable thread source is first entered into the slit 31, after which the bobbin is set in motion, and the winding of the thread takes place on the core 3| between the flanges 32 and 33. The end of the thread or tail which projects through the slit eventually becomes wound about the core part 36 and serves as a starting means by which a partially wound bobbin may be connected to a filled one in subsequent operations. Although for reasons of economy the core part projecting from the flange is preferably made the same diameter and shape as the core itself, nevertheless this core part can have any other suitable shape and diameter. It may, for example, be a polyhedron having four, six or any number of sides, as shown for example in Figures 7 and 8. The core part may, of course, also be provided with grooves to facilitate the catching 0f the thread tail. Although the slit in the flange may be radial or non-radial and may or may not extend from the periphery of the flange to the core, nevertheless I wish to emphasize that the slit is preferably radial, extending from the periphery of the flange to the core, since this allows the best catching of the thread tail on the outwardly extending core part designed to accept the same; It is, of course, to be understood that the width of the slit must be sufllcient to facilitate insertion of the thread without allowing the same to escape and that the walls of the slit are smooth to prevent damage to the yarn when entering the same.

, While in the foregoing there has been shown and described the preferred embodiments of this invention. it is to be understood that minor changes in the details of construction, combinations and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as defined by the appended claims.

I claim:

1. In the method of attaching a textile thread coming from a continuous source of supply to a bobbin of a ring twisting machine wherein said bobbin is provided with a flange having a slit and core portions extending above and below said flange and is adapted to be started and is used for winding the thread on the core portion disposed above said flange, the steps of passing said thread through the slit in said flange while said bobbin is at rest, setting said bobbin in rotation to efle'ct winding of said thread through intermediary of said reciprocating guide solely on the core portion disposed above said flange, and maintaining a tail of thread projecting from said slit and beneath said flange whereby said projecting tail will wind itself solely around the core portion of the bobbin disposed beneath said flange when said bobbin is rotated.

2. The method of threading a ring twisting machine with a moving textile thread issuing continuously from a source, said ring twisting machine comprising a reciprocatable ring, a ring traveler, a rotatable bobbin having flanges defining therebetween a thread winding zone, one of said flanges having an opening therein through which thread may be passed, and means for initiating and terminating rotation of the bobbin and reciprocation of the ring, which comprises passing the free end of the oncoming thread through the ring traveler and temporarily collecting the moving thread at a point adjacent the bobbin. pulling the thread at a point intermediate the ring traveler and the point of temporary collection through the opening in the flange, and initiating operation of the machine to wind 9. main body of twisted thread in the winding zone of the bobbin while leaving residual thread on the other side of the flange having the opening therein. I

LA VERNE R. GRAYBEAL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS.

Number Name Date 1,959,452 Welch May 22, 1934' 1,976,332 Curtis Oct. 9, 1934 2,096,316 Beran Oct. 19, 1937 5 2,261,239 Elvin et a1 Nov. 4, 1941 stopped and wherein a reciprocating thread guide Cole Dec. 1, 1942 

